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Tue, 4 Jun 2024 05:02:13 -0500 From: Jai Luthra Date: Tue, 4 Jun 2024 15:31:50 +0530 Subject: [PATCH 1/2] ALSA: dmaengine: Synchronize dma channel in prepare() Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240604-asoc_next-v1-1-e895c88e744d@ti.com> References: <20240604-asoc_next-v1-0-e895c88e744d@ti.com> In-Reply-To: <20240604-asoc_next-v1-0-e895c88e744d@ti.com> To: Lars-Peter Clausen , Jaroslav Kysela , Takashi Iwai , Liam Girdwood , Mark Brown , Peter Ujfalusi CC: , , , Jai Luthra X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=3301; i=j-luthra@ti.com; h=from:subject:message-id; bh=Lp+scTaXNWTPUO0ppKiFayLUI/w7Lod4/XYkk1TOgYk=; b=owEBbQKS/ZANAwAIAUPekfkkmnFFAcsmYgBmXuYh9yZyRFY1oPeChZAutrbwaZau4OIiTYsWG pV9DiYd19yJAjMEAAEIAB0WIQRN4NgY5dV16NRar8VD3pH5JJpxRQUCZl7mIQAKCRBD3pH5JJpx RS2/D/41LHb4Icv0t+Lr/32mgIHhUKYtv2gO0KaylT2Q4MuMNr8MCN5WYT5tvAfjffSWaKjuJJw h16AQbN/tvOyixRyIpvROT/gslnNbrcgl4hTkEGpqZfzOxHqrupF1vf8vBrugqj1/nZ+4HwU3d/ j4PCQCR23mkm/HEqA5liaAP6E0y74ffddxyODC83zzOYmYqMDffEelGHNsA1Lb5VpiHWpG9KGTn SAYp3M4J7D2M2Ve08MjPGtWysIL0HObBslzq/1SU8W9+xXxdCNcTcvOJwPMrmjBnzsRzVHnTL6l Oh2WiClkZJwtgS0y7+XtpukbI4zU+OAhdAY5JOxpMDAC9stfMXEFqtd+GGpeSQDQCHbqXE+F7pO 6UeKyz+uCfTuY3OdB61OamgOl+oAoRsRtyDocZctceqL1JKqHkgAQC3a2A3ciZfonj8WGd5teTI iUfbsQVnbYdwI4NowAxHX7BD2bZks+HP5CPA8zU9hZ4PPG2T2kuiLJqGkZM+FA+pEVsa7I13Z7N xneZa/NLYjl8V+pXti1RZBmKMBSbBCYaWs56I6wCGX040JTRouzM8X8NP6ltC9z6wuznZkzMOVq Dsh5/0i8ix7YkpEBcSBfgEQQkaW9WS0Y3tneXNAMLH9ZeYOtc8jjzT+U2y9+TW2trR12CvGSp9j AC6e1lbZ3Y97v9w== X-Developer-Key: i=j-luthra@ti.com; a=openpgp; fpr=4DE0D818E5D575E8D45AAFC543DE91F9249A7145 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sometimes the stream may be stopped due to XRUN events, in which case the userspace can call snd_pcm_drop() and snd_pcm_prepare() to stop and start the stream again. In these cases, we must wait for the DMA channel to synchronize before marking the stream as prepared for playback, as the DMA channel gets stopped by snd_pcm_drop() without any synchronization. Signed-off-by: Jai Luthra Reviewed-by: Peter Ujfalusi --- include/sound/dmaengine_pcm.h | 1 + sound/core/pcm_dmaengine.c | 10 ++++++++++ sound/soc/soc-generic-dmaengine-pcm.c | 8 ++++++++ 3 files changed, 19 insertions(+) diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index c11aaf8079fb..9c5800e5659f 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h @@ -36,6 +36,7 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, struct dma_chan *chan); int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); +int snd_dmaengine_pcm_prepare(struct snd_pcm_substream *substream); int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data); diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 12aa1cef11a1..dbf5c6136d68 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -349,6 +349,16 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); +int snd_dmaengine_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + + dmaengine_synchronize(prtd->dma_chan); + + return 0; +} +EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare); + /** * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream * @substream: PCM substream diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index ea3bc9318412..af439486d33a 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -318,6 +318,12 @@ static int dmaengine_copy(struct snd_soc_component *component, return 0; } +int dmaengine_pcm_prepare(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_prepare(substream); +} + static const struct snd_soc_component_driver dmaengine_pcm_component = { .name = SND_DMAENGINE_PCM_DRV_NAME, .probe_order = SND_SOC_COMP_ORDER_LATE, @@ -327,6 +333,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component = { .trigger = dmaengine_pcm_trigger, .pointer = dmaengine_pcm_pointer, .pcm_construct = dmaengine_pcm_new, + .prepare = dmaengine_pcm_prepare, }; static const struct snd_soc_component_driver dmaengine_pcm_component_process = { @@ -339,6 +346,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component_process = { .pointer = dmaengine_pcm_pointer, .copy = dmaengine_copy, .pcm_construct = dmaengine_pcm_new, + .prepare = dmaengine_pcm_prepare, }; static const char * const dmaengine_pcm_dma_channel_names[] = {